Texas Instruments INA310B2QDGKRQ1

Overview

INA310B2QDGKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to +125°C) ultra-precise current sense amplifier with integrated open-drain comparator and 0.6 V internal reference, designed for high-side or low-side shunt monitoring in automotive power systems. It delivers 50 V/V fixed gain, −4 V to +110 V common-mode input range, 1.3 MHz bandwidth, and ±150 µV max offset voltage - enabling accurate, high-speed overcurrent detection in eTurbo, EPS, and regenerative braking circuits.

For engineers reviewing the INA310B2QDGKRQ1 datasheet, INA310B2QDGKRQ1 pinout, INA310B2QDGKRQ1 application, or INA310B2QDGKRQ1 equivalent, key selection considerations include its automotive-grade temperature stability, latching comparator mode, 1 µs propagation delay, wide supply range (2.7 V–20 V), and VSSOP-8 package compatibility with space-constrained motor control PCB layouts.

Technical Context

The INA310B2QDGKRQ1 employs a zero-drift precision amplifier topology with 140–160 dB CMRR across −40°C to +125°C, enabling stable current measurement despite high common-mode transients up to 120 V survival rating. Its 50 V/V gain version maintains ±0.5% max gain error and ±1 µV/°C offset drift, optimized for mid-range dynamic sensing where signal-to-noise ratio and output swing headroom must be balanced.

Integrated comparator functionality uses a 0.6 V internal reference with 8 mV hysteresis and supports both transparent (RESET = GND/open) and latched (RESET = VS) modes. Propagation delay remains ≤1 µs with 20 mV overdrive, and CMPIN accepts 0–5.5 V inputs independent of VS - allowing flexible external resistor-divider trip-point configuration without level-shifting circuitry.

Key Specifications

Pinout & Package

VSSOP-8 package (3.00 mm × 4.90 mm), thermally enhanced for automotive under-hood operation; 0.65 mm pitch, exposed pad optional for improved thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current sense amplifier applications.

Compared with INA240A1QDRQ1 and MAX40056ATA+T, the INA310B2QDGKRQ1 uniquely combines automotive-grade latching comparator, 1.3 MHz bandwidth, and −4 V to +110 V common-mode in a single VSSOP-8 package - making it the only option that satisfies ASIL-B hardware fault tolerance requirements for EPS and eTurbo without external components.

Availability

INA310B2QDGKRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), eTurbo control, and regenerative braking systems requiring stable component supply across extended automotive production lifecycles.

Supply support for INA310B2QDGKRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade signal conditioning and functional safety design.

The INA310x-Q1 product line was engineered specifically for high-reliability automotive current sensing, addressing the need for integrated, AEC-Q100-compliant amplifiers with hardware-enforced overcurrent protection in electrified powertrain systems.

FAQ

What is the maximum common-mode voltage the INA310B2QDGKRQ1 can withstand during normal operation?

The INA310B2QDGKRQ1 operates over a common-mode input range of −4 V to +110 V, meaning it can accurately measure shunt voltage drops in high-side configurations on 48 V or 60 V bus systems. Its survival rating extends to −20 V to +120 V, protecting against load-dump transients without damage. This capability is intrinsic to its architecture and does not depend on supply voltage.

Does the INA310B2QDGKRQ1 require external components to configure the overcurrent trip point?

Yes - the INA310B2QDGKRQ1 uses an external resistor divider from OUT to GND to set the comparator trip point at CMPIN. With its internal 0.6 V reference, the trip threshold is VTRIP = 0.6 V × (R1 + R2)/R2. TI recommends keeping the total divider resistance below 100 kΩ to minimize error from comparator input bias current, which stays under 20 nA near the 0.6 V threshold.

How does the RESET pin affect comparator behavior in the INA310B2QDGKRQ1?

The RESET pin configures the comparator's operational mode: when left open or tied to GND, the INA310B2QDGKRQ1 operates in transparent mode (CMPOUT follows CMPIN in real time); when pulled high to VS, it enters latching mode - once triggered, CMPOUT stays high until RESET is actively pulled low or released. This latching behavior is essential for fail-safe fault retention in ASIL-B systems like EPS.

What is the typical propagation delay from overcurrent event to CMPOUT assertion in the INA310B2QDGKRQ1?

The INA310B2QDGKRQ1 achieves a total propagation delay of 1 µs (typical) from the moment VSENSE exceeds the programmed trip threshold to CMPOUT going active-low (open-drain). This includes amplifier settling, external resistor-divider response, and comparator decision time - verified at 20 mV overdrive and specified across −40°C to +125°C, making it suitable for fast-acting safety-critical protection.

Can the INA310B2QDGKRQ1 be used in low-side current sensing configurations?

Yes - the INA310B2QDGKRQ1 supports both high-side and low-side shunt configurations. For low-side use, connect IN+ to the load side of the shunt and IN− to system ground. Its rail-to-rail output swing (down to 5 mV above GND) and 50 V/V gain ensure usable signal amplitude even with small shunt voltages, while the −4 V to +110 V common-mode range remains fully functional regardless of configuration.